Lie detection via electrogastrography
AssigneeBoard of Regents, The University of Texas System
InventorsPankaj J. Pasricha, Trisha Pasricha, Jiande Chen
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Abstract
The present invention provides a device and methods of lie detection utilizing electrogastrography to monitor changes in the gastric electric rhythm of a subject. Also provided are methods of discriminating between the stress of deception induced in a subject during a lie detection examination and the stress of the examination itself.
Claims22
A device for lie detection, comprising:
- means for measuring involuntary heart rate variability (HRV);
- means for measuring gastric electric rhythm;
- and
- a processing unit operatively connected to the means for measuring the HRV and the gastric electric rhythm;
- wherein said processing unit is configured to record said measurements and to utilize said recorded measurements to:
- (i) determine a baseline level of physiological response for both HRV and gastric electric rhythm for a plurality of control questions;
- (ii) determine a change in said physiological responses from baseline for each question of a plurality of relevant questions;
- and
- (iii) compare said changes in physiological response to identify truthfulness or lack thereof of a response to each relevant question.
A method for evaluating the truthfulness of a subject, comprising:
- posing a plurality of control questions to the subject;
- posing a plurality of relevant questions to the subject;
- determining heart rate variability (HRV) and gastric electric rhythm in the subject after posing the controlling questions to obtain a baseline for each of said HRV and gastric electric rhythm;
- determining HRV and gastric electric rhythm in the subject after posing the relevant questions;
- and
- comparing the HRV and gastric electric rhythm after posing said relevant questions with the HRV baseline and the gastric electric rhythm baseline;
- wherein an occurrence of bradygastria during posing of said relevant questions compared to the corresponding baseline is indicative of truthfulness even if HRV increases compared to its corresponding baseline during posing of said relevant questions.
A method of discriminating between stress of deception induced in a subject during a polygraph test and stress induced from the polygraph test itself, comprising:
- administering a polygraph test to the subject comprising recording a gastric electric rhythm and another involuntary physiological response of at least heart rate variability (HRV) that occur when a plurality of control questions and a plurality of relevant questions are posed to the subject;
- comparing a physiological change in a gastric electric rhythm from a baseline level with a physiological change in HRV from its baseline level;
- wherein a bradygastric change with an increase in HRV is indicative of stress induced from the polygraph test itself and a tachygastric change with an increase in HRV is indicative of stress induced from deception.
A method of improving the accuracy of lie detection during a polygraph examination of an individual, comprising:
- monitoring heart rate variability during administration of the polygraph examination;
- and
- monitoring concurrently a gastric electric rhythm of the individual, wherein a change in gastric electric rhythm is indicative of a truthful or of a false response even if an increase in heart rate variability sufficient to indicate a false response is detected, thereby improving the accuracy of lie detection during the polygraph examination.
Dependencies are inferred from the claim text.